title: Nonclinical toxicology assessments support the chronic safety of dapagliflozin, a first-in-class sodium-glucose cotransporter 2 inhibitor.
abstract: Dapagliflozin, a first-in-class, selective inhibitor of sodium-glucose cotransporter 2 (SGLT2), promotes urinary glucose excretion to reduce hyperglycemia for the treatment of type 2 diabetes. A series of nonclinical studies were undertaken to evaluate dapagliflozin in species where it was shown to have pharmacologic activity comparable with that in humans at doses that resulted in supratherapeutic exposures. In vitro screening (>300 targets; 10 μmol/L) indicated no significant off-target activities for dapagliflozin or its primary human metabolite. Once daily, orally administered dapagliflozin was evaluated in Sprague-Dawley rats (≤6 months) and in beagle dogs (≤1 year) at exposures >5000-fold those observed at the maximum recommended human clinical dose (MRHD; 10 mg). Anticipated, pharmacologically mediated effects of glucosuria, osmotic diuresis, and mild electrolyte loss were observed, but there were no adverse effects at clinically relevant exposures, including in the kidneys or urogenital tract. The SGLT2-/- mice, which show chronic glucosuria, and dapagliflozin-treated, wild-type mice exhibited similar safety profiles. In rats but not dogs, dapagliflozin at >2000-fold MRHD exposures resulted in tissue mineralization and trabecular bone accretion. Investigative studies suggested that the effect was not relevant to human safety, since it was partially related to off-target inhibition of SGLT1, which was observed only at high doses of dapagliflozin and resulted in intestinal glucose malabsorption and increased intestinal calcium absorption. The rigorous assessment of supra- and off-target dapagliflozin pharmacology in nonclinical species allowed for a thorough evaluation of potential toxicity, providing us with confidence in its safety in patients with diabetes.
authors.affiliation: Bristol Myers-Squibb, R&D, 1 Squibb Drive, New Brunswick, NJ 08903, USA. Email: mark.tirmenstein@bms.com.
authors.forename: Mark
authors.initials: M
authors.lastname: Tirmenstein
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Dorr
authors.forename: Evan B
authors.initials: EB
authors.lastname: Janovitz
authors.forename: Deborah
authors.initials: D
authors.lastname: Hagan
authors.forename: Lynn M
authors.initials: LM
authors.lastname: Abell
authors.forename: Joelle M
authors.initials: JM
authors.lastname: Onorato
authors.forename: Jean M
authors.initials: JM
authors.lastname: Whaley
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Graziano
authors.forename: Timothy P
authors.initials: TP
authors.lastname: Reilly
mesh_terms: D000818:Animals; D001559:Benzhydryl Compounds; D016466:CHO Cells; D003412:Cricetulus; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical; D005260:Female; D005960:Glucosides / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000633:toxicity*; D006801:Humans; D007004:Hypoglycemic Agents / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000633:toxicity*; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D018345:Mice, Knockout; D051381:Rats; D017207:Rats, Sprague-Dawley; D051297:Sodium-Glucose Transporter 2 / Q000235:genetics; D000077203:Sodium-Glucose Transporter 2 Inhibitors
chemical_list: D001559:Benzhydryl Compounds; D005960:Glucosides; D007004:Hypoglycemic Agents; D051297:Sodium-Glucose Transporter 2; D000077203:Sodium-Glucose Transporter 2 Inhibitors; C529054:dapagliflozin
keywords: SGLT2 inhibition; bone; dapagliflozin; glucosuria; pharmaceutical safety; type 2 diabetes